US4738232A - Fuel primer for float type carburetors - Google Patents

Fuel primer for float type carburetors Download PDF

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Publication number
US4738232A
US4738232A US06/903,214 US90321486A US4738232A US 4738232 A US4738232 A US 4738232A US 90321486 A US90321486 A US 90321486A US 4738232 A US4738232 A US 4738232A
Authority
US
United States
Prior art keywords
fuel
resilient means
plunger
bowl
primer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/903,214
Other languages
English (en)
Inventor
William A. Scott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tillotson Ltd
Original Assignee
Tillotson Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tillotson Ltd filed Critical Tillotson Ltd
Assigned to TILLOTSON, LTD. reassignment TILLOTSON, LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCOTT, WILLIAM A.
Priority to US06/903,214 priority Critical patent/US4738232A/en
Priority to CA000544261A priority patent/CA1300445C/en
Priority to GB8719540A priority patent/GB2194595B/en
Priority to IT21712/87A priority patent/IT1222542B/it
Priority to JP62216580A priority patent/JPS6365161A/ja
Priority to DE19873729190 priority patent/DE3729190A1/de
Priority to KR870009662A priority patent/KR880004214A/ko
Priority to BR8704504A priority patent/BR8704504A/pt
Priority to MX8084A priority patent/MX160027A/es
Publication of US4738232A publication Critical patent/US4738232A/en
Application granted granted Critical
Priority to GB9003240A priority patent/GB2227797B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/16—Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/08—Carburetor primers

Definitions

  • the present invention relates to carburetors for small internal combustion engines and more particularly, to fuel primers for float type carburetors providing fuel into the combustion chamber prior to starting of the internal combustion engine.
  • the starting procedure for an internal combustion engine having a float type carburetor is as follows.
  • the choke is set in an on position and the throttle is set in its start position.
  • the carburetor bowl is filled with fuel and then the engine cord is pulled several times.
  • the engine fires and quits due to excessive fuel entering the combustion chamber.
  • the choke is then put in the off position.
  • Several pulls of the rope are usually required after choke off to start and run.
  • the engine will quite again and the above procedure must be repeated until engine eventually starts and continuously runs. Normally, several pulls (approximately 8-10 of the starter cord are needed to accomplish starting of the internal combustion engine.
  • the present invention provides the art with a fuel primer for float type carburetors.
  • the present invention enables an internal combustion engine, having a float type carburetor to start and continue to run without stopping during an intended warm-up period.
  • the present invention enables the operator to position the butterfly choke from a closed, to a run position during engine warm-up without stalling.
  • the present invention enables fuel to be drawn into the combustion chamber of the engine cylinders utilizing existing inlets and outlets of conventional float type carburetors.
  • the float type carburetor fuel primer of the present invention is associated with a fuel bowl of a float type carburetor.
  • the fuel bowl is generally coupled with a fuel inlet and has an outlet to ambient air.
  • the fuel bowl is associated with the carburetor venturi through a nozzle which discharges fuel from the fuel bowl into the combustion path.
  • the fuel inlet is associated with a fuel source for enabling fuel to enter into the fuel bowl.
  • the fuel primer includes a mechanism coupled with the atmospheric outlet vent for introducing a pressurized flow, via the atmospheric outlet vent, into the fuel bowl. The pressurized flow introduces fuel in the fuel bowl to pass, via the nozzle, into the combustion path which, in turn, enables the fuel to pass into the combustion chamber.
  • the mechanism for introducing pressurized flow into the fuel bowl includes a resilient mechanism coupled with the atmospheric outlet vent.
  • the resilient mechanism pressurizes the primer upon compression.
  • An activation mechanism is associated with the resilient mechanism. The activating mechanism compresses the resilient means upon activation, thus activating the primer.
  • FIG. 1 is a partial cross-section view of a float type carburetor including a fuel primer in accordance with the present invention.
  • a fuel primer is shown and designated with reference numeral 10.
  • the fuel primer 10 is associated with a carburetor 12 of a small internal combustion engine.
  • the carburetor is of a float type having a butterfly type choke.
  • the carburetor 12 has a fuel inlet 14 connected to a conduit 16 which, in turn, communicates with a fuel tank 18 having a vent to atmosphere 20.
  • the fuel tank 18 may be of the gravity type or a pressure bulb 22 may be inserted into the conduit 16 for supplying fuel to the carburetor 12.
  • the fuel bowl 24 includes a stand pipe 26 having a nozzle 28, positioned within the stand pipe 26, for enabling fuel to pass into the venturi 30.
  • An air bleed outlet mechanism 42 is associated with the stand pipe 26.
  • a float 32 is positioned about the stand pipe 26 for indicating the level of fuel 25 in the bowl 24.
  • a nut 34 is associated with the fuel bowl 24 for fastening the bowl to the body.
  • the carburetor 12 includes a butterfly choke 36 having at least one aperture 38 therein positioned within the venturi 30.
  • the venturi 30 has a butterfly valve 40 for metering air and fuel flow into the engine combustion chamber.
  • the venturi 30 is positioned and secured onto a manifold 31 such that the fuel entering the combustion chamber from the venturi flows toward the combustion chamber.
  • the primer 10 comprises a pressurizing mechanism 50 associated with the fuel bowl atmospheric outlet vent 15.
  • a mechanism 52 for activating the pressurizing mechanism 50 is positioned adjacent the mechanism 50.
  • the pressurizing mechanism 50 includes a conduit 54 coupled with the outlet 15 for enabling air flow into and from the fuel bowl 24.
  • a resilient bulb 56 is associated with the other end of the conduit 54.
  • the resilient bulb 56 generally formed from a conventional rubberized material, enables compression of the fluid in the bulb 56 and conduit 54 which, in turn, passes pressurized fluid through the outlet into the fuel bowl 24 as described herein.
  • the bulb 56 has an aperture 58 in its surface for enabling the bowl 24 to vent to ambient air when the bulb 56 is not being compressed.
  • the size of the bulb 56 may be changed which, in turn, changes the volume of fluid entering the fuel bowl 24 controlling the amount of fuel entering the venturi 30.
  • the activating mechanism 52 includes a housing 60 having a plunger 62 slidably secured within the housing 60.
  • the plunger 62 has a stop 64, a stem 66, and a body portion 68 which slidably engages the housing 60.
  • the stem 66 has a biasing member 70, preferably a helical spring, positioned about the exterior of the stem 66 biased between the stop 64 and housing 60 for enabling reciprocal sliding movement of the body 68 within the housing 60.
  • the body 68 has an aperture 70 for enabling a second plunger 72 to be retractably and extendably secured in the body 68 of the first plunger 62.
  • the second plunger has an overall T-shape having a stop 74 and a threaded stem 76.
  • the threaded stem 76 enables the stop 72 to be rotated and retracted into and extend from the body portion 68.
  • This positioning of the second plunger 72, with respect to the first plunger 62, enables the volume of air entering into the fuel bowl 24 to be controlled.
  • the volume is controlled by positioning the stop 74 of the plunger 72 a desired distance from the body 68 of the plunger 62 which enables the bulb 56 to be compressed enabling a desired volumetric amount of pressurized air to enter into the fuel bowl 24 which, in turn, introduces a desired amount of fuel into the venturi and into the combustion chamber.
  • the air bleed mechanism 42 includes a conduit 90 having one end associated with the stand pipe 28 and the other end having a one way valve 92.
  • the one way valve 92 is open to ambient air and is closed to fuel attempting to exit during priming. Once the engine begins to start and continues to run, air may be drawn into the stand pipe 26 via conduit 90 and one way valve 92. Also, ambient air may enter into the fuel bowl 24 through aperture 58 in bulb 56 for venting of the fuel bowl 24.
  • the housing 60 of the activation means is positioned on the housing 80 of the marine outboard motor.
  • the plunger 62 is on the exterior of the housing 80 enabling activation of the primer from outside the housing 80.
  • the housing 80 of the marine outboard motor protects the open resilient bulb 56 from the elements and enables only air within the housing 80 to enter the bowl 24 thus, keeping out the elements such as rain, dew, and the like from contaminating the fuel supply.
  • the primer of the present invention functions as follows.
  • the fuel bulb 22 is pumped several times drawing fuel from the tank 18 into the fuel bowl 24 via conduit 16 and the fuel inlet 14.
  • Fuel 25 is drawn into the fuel bowl 24 until the float 32 stops flow of the fuel into the fuel bowl 24. At this time, the fuel bowl 24 is full of fuel and ready for priming by the present invention.
  • the plunger 62 is pushed into the housing 60 which, in turn, forces stop 74 of plunger 72 against the resilient bulb 56.
  • the compressing of bulb 56 causes air within the bulb 56 and conduit 52 to be pressurized and the pressurized air flows into the fuel bowl 24 via the outlet 15.
  • the pressurized air entering the fuel bowl 24 forces fuel 25 to enter the nozzle 28, via stand pipe inlet 27, and out into venturi 30.
  • Fuel is introduced into the venturi 30 and flows into the combustion chamber. Depending upon the volumetric size of the bulb 56, a controlled amount of fuel can be introduced into the combustion chamber for enabling starting of the engine.
  • the butterfly choke 36 having apertures 38 enables air to bypass the choke 36 while the operator is attempting to start the engine which, in turn, enables the engine to continue to run while providing the operator with time to shift the choke, during the warm up stage, from a closed to an open position.
  • the engine starts and continues to run with a minimum amount of pulls on the engine cord.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Fuel-Injection Apparatus (AREA)
US06/903,214 1986-09-02 1986-09-02 Fuel primer for float type carburetors Expired - Lifetime US4738232A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US06/903,214 US4738232A (en) 1986-09-02 1986-09-02 Fuel primer for float type carburetors
CA000544261A CA1300445C (en) 1986-09-02 1987-08-11 Fuel primer for float type carburetors
GB8719540A GB2194595B (en) 1986-09-02 1987-08-19 Fuel primer for float type carburettors
IT21712/87A IT1222542B (it) 1986-09-02 1987-08-25 Iniettore di combustibile per carburatori del tipo a galleggiante
KR870009662A KR880004214A (ko) 1986-09-02 1987-09-01 플로우트식 기화기용 연료 주입기
DE19873729190 DE3729190A1 (de) 1986-09-02 1987-09-01 Anlasskraftstoffzufuehreinrichtung fuer schwimmer-vergaser
JP62216580A JPS6365161A (ja) 1986-09-02 1987-09-01 フロート型気化器用燃料プライマ
BR8704504A BR8704504A (pt) 1986-09-02 1987-09-01 Escova de combustivel e escova para motores de popa maritimos
MX8084A MX160027A (es) 1986-09-02 1987-09-02 Mejoras en carburador de tipo flotante para motores marinos fuera de borda o similares
GB9003240A GB2227797B (en) 1986-09-02 1990-02-13 Fuel primer for float type carburetors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/903,214 US4738232A (en) 1986-09-02 1986-09-02 Fuel primer for float type carburetors

Publications (1)

Publication Number Publication Date
US4738232A true US4738232A (en) 1988-04-19

Family

ID=25417120

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/903,214 Expired - Lifetime US4738232A (en) 1986-09-02 1986-09-02 Fuel primer for float type carburetors

Country Status (9)

Country Link
US (1) US4738232A (it)
JP (1) JPS6365161A (it)
KR (1) KR880004214A (it)
BR (1) BR8704504A (it)
CA (1) CA1300445C (it)
DE (1) DE3729190A1 (it)
GB (2) GB2194595B (it)
IT (1) IT1222542B (it)
MX (1) MX160027A (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5273008A (en) * 1992-08-17 1993-12-28 Tecumseh Products Company Balance vent for an internally vented float bowl carbuetor
US5740781A (en) * 1996-05-09 1998-04-21 Tillotson, Ltd. Starting system for an internal combustion engine
US5750056A (en) * 1996-09-18 1998-05-12 Murray, Inc. Remotely controlled primer actuator for power equipment engines
US6029619A (en) * 1998-02-04 2000-02-29 Briggs & Stratton Corporation Remote primer
US6557833B1 (en) 2000-10-20 2003-05-06 Briggs & Stratton Corporation Priming system for an engine carburetor
US7152852B1 (en) 2004-02-17 2006-12-26 Walbro Japan, Inc. Priming system for a float bowl carburetor
US20120318249A1 (en) * 2009-12-04 2012-12-20 Husqvarna Consumer Outdoor Products N.A. Inc. Fuel delivery system for an internal combustion engine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5210200B2 (ja) * 2009-02-23 2013-06-12 株式会社ニッキ 始動装置付気化器
CN103382904A (zh) * 2013-07-31 2013-11-06 博浪柯(浙江)机电制造有限公司 汽油机无阻风门燃油混合气自动加浓启动系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1384429A (en) * 1918-02-11 1921-07-12 Stromberg Motor Devices Co Carbureter
US3345045A (en) * 1964-08-21 1967-10-03 Clinton Engines Corp Primer for internal combustion engines
US3430933A (en) * 1967-12-14 1969-03-04 Melvin C Taggart Primer attachment for carburetors
US4204511A (en) * 1979-01-19 1980-05-27 Outboard Marine Corporation Combination ignition switch and fuel priming system
JPS55164747A (en) * 1979-06-08 1980-12-22 Nippon Soken Inc Fuel feed device for engine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050936A (it) *
DE543249C (de) * 1928-10-24 1932-02-08 Pallas App Ges M B H Vergaser mit Zusatzbrennstoffpumpe
GB461034A (en) * 1934-12-13 1937-02-09 Raoul Eugene Cossais Device for preventing evaporation of volatile products employed in internal combustion engines
US3281129A (en) * 1965-06-14 1966-10-25 Clinton Engines Corp Primer for internal combustion engine
US3347216A (en) * 1965-09-20 1967-10-17 Bendix Corp Choke control device
FR1485617A (fr) * 1966-04-08 1967-06-23 Sibe Perfectionnements apportés aux dispositifs de carburation avec cuve à niveau constant pour moteurs à combustion interne
FR2153629A5 (it) * 1971-09-17 1973-05-04 Gurtner Sa
SE365581B (it) * 1972-10-24 1974-03-25 Partner Ab
US4375795A (en) * 1980-08-04 1983-03-08 Outboard Marine Corporation Dual fuel supply system
US4411844A (en) * 1982-02-11 1983-10-25 Outboard Marine Corporation Priming system for a vented bowl carburetor
US4679534A (en) * 1986-02-25 1987-07-14 Tecumseh Products Company Primer for float-type carburetors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1384429A (en) * 1918-02-11 1921-07-12 Stromberg Motor Devices Co Carbureter
US3345045A (en) * 1964-08-21 1967-10-03 Clinton Engines Corp Primer for internal combustion engines
US3430933A (en) * 1967-12-14 1969-03-04 Melvin C Taggart Primer attachment for carburetors
US4204511A (en) * 1979-01-19 1980-05-27 Outboard Marine Corporation Combination ignition switch and fuel priming system
JPS55164747A (en) * 1979-06-08 1980-12-22 Nippon Soken Inc Fuel feed device for engine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5273008A (en) * 1992-08-17 1993-12-28 Tecumseh Products Company Balance vent for an internally vented float bowl carbuetor
US5740781A (en) * 1996-05-09 1998-04-21 Tillotson, Ltd. Starting system for an internal combustion engine
US5750056A (en) * 1996-09-18 1998-05-12 Murray, Inc. Remotely controlled primer actuator for power equipment engines
US6029619A (en) * 1998-02-04 2000-02-29 Briggs & Stratton Corporation Remote primer
US6557833B1 (en) 2000-10-20 2003-05-06 Briggs & Stratton Corporation Priming system for an engine carburetor
US7152852B1 (en) 2004-02-17 2006-12-26 Walbro Japan, Inc. Priming system for a float bowl carburetor
US20120318249A1 (en) * 2009-12-04 2012-12-20 Husqvarna Consumer Outdoor Products N.A. Inc. Fuel delivery system for an internal combustion engine
US8925509B2 (en) * 2009-12-04 2015-01-06 Husqvarna Ab Fuel delivery system for an internal combustion engine
US9103299B2 (en) 2009-12-04 2015-08-11 Husqvarna Ab Fuel delivery system for an internal combustion engine

Also Published As

Publication number Publication date
GB2194595B (en) 1990-11-28
GB8719540D0 (en) 1987-09-23
BR8704504A (pt) 1988-04-19
IT8721712A0 (it) 1987-08-25
JPS6365161A (ja) 1988-03-23
DE3729190A1 (de) 1988-03-03
MX160027A (es) 1989-11-09
CA1300445C (en) 1992-05-12
GB2227797B (en) 1990-11-28
GB2194595A (en) 1988-03-09
IT1222542B (it) 1990-09-05
GB9003240D0 (en) 1990-04-11
GB2227797A (en) 1990-08-08
KR880004214A (ko) 1988-06-02

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Owner name: TILLOTSON, LTD., CLASH INDUSTRIAL ESTATE, TRALEE,

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